When Microsoft Exchange Server is installed, it creates the publicly exported directory shares \\SERVER\ADD-INS, \\SERVER\ADDRESS, and \\SERVER\CONNECT$. Under these directories, subdirectories called Extension-Name and Platform designate the name of the application being installed and the platform it runs on. (For information about platform designations, see Installing the Administrator Extension DLL.) The Extension-Name and Platform subdirectories, along with the directory for the application's executable file, must be created by the server application setup program.
These directories are used as follows:
\\SERVER\ADD-INS\EXTENSION-NAME\PLATFORM
\\SERVER\ADDRESS\EXTENSION-NAME\PLATFORM
\\SERVER\CONNECT$\EXTENSION-NAME\PLATFORM